Bai, J. and Zheng, P.-F., 2019. Catalytic function of coastal economy development on inland economy. In: Gong, D.; Zhu, H., and Liu, R. (eds.), Selected Topics in Coastal Research: Engineering, Industry, Economy, and Sustainable Development. Journal of Coastal Research, Special Issue No. 94, pp. 727–731. Coconut Creek (Florida), ISSN 0749-0208.China is striving to realize the regional integration development of coastal and inland economies. It is a key strategy for economic development at present stage in China. To scientifically lead the synergetic development of regional economy integration, this paper attempts to analyze and conclude the driving forces the coastal economy can play on the inland economy from the theoretical and practical perspectives. Based on the theories of port-Hinterland interaction and regional division of labor, it is investigated about how the economies in coastal port and inland cities in Liaoning Province are developing now. With data of GDPs and location quotient available for real cases as reference, the interactive synergy between coastal and inland community economies is measured quantitatively using the Logistic model in an attempt to conclude the push-pull powers between the two with the marginal and elastic analysis. In addition, a synergistic development strategy is also made for coastal and inland community economies. A quantitative and qualitative study is indeed significant for leading the synthetic development of regional economies.